package thread;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class SimplePriorities implements Runnable {

    private int countDown = 5;
    private volatile double d;
    private int priority;
    public SimplePriorities(int priority){
        this.priority = priority;
    }

    @Override
    public String toString() {
        return Thread.currentThread() +": "+countDown;
    }

    @Override
    public void run() {
        Thread.currentThread().setPriority(priority);
        while (true){
            for (int i = 0;i < 10000;i ++){
                d += (Math.PI + Math.E) /(double)i;
                if (i % 1000 == 0){
                    Thread.yield();
                }
            }
            System.out.println(this);
            if (--countDown == 0) return;
        }
    }

    public static void main(String[] args) {
        ExecutorService exec = Executors.newCachedThreadPool();
        for (int i = 0;i < 5;i ++){
            exec.execute(new SimplePriorities(Thread.MIN_PRIORITY));
        }
        exec.execute(new SimplePriorities(Thread.MAX_PRIORITY));
    }
}
